I think Lord Andrew Mountbatten Windsor would be a good solution. It might also set an example for others who are close in line of succession but not working Royals. I think they in time will also loose their HRH and princely title (im thinking of grandchildren of the sovereign or the main line). 
Previous Message
As of this moment, the web page for the Line of Succession is not yet edited.
Perhaps the matter of title, if any, is being debated.
I see three possibilities for position 8 -
Andrew Mountbatten Windsor
Mr Andrew Mountbatten Windsor
Lord Andrew Mountbatten Windsor - as the younger son of a duke.
https://www.royal.uk/encyclopedia/succession
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on 1/11/2025, 8:27:23, in reply to "